Holley Premium Mid-Mount Complete Accessory System - 20-180
SKU: 337377375

Holley Premium Mid-Mount Complete Accessory System - 20-180

Sale price$1507.47 Regular price$1674.97
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Description

Holley Premium Mid-Mount Complete Accessory System - 20-180Overview: Holley's Premium Mid Mount complete accessory system has all accessories pulled in tighter than other accessory drives. At the heart of the system is a "bracketless" design (Patent Pending), where the accessories bolt directly to the water pump for a clean, integrated form. The design offers superb engine visibility to show off your horsepower, not your accessories. Among the many swap friendly features are bottom heater outlets for

Overview:

Holley's Premium Mid-Mount complete accessory system has all accessories pulled in tighter than other accessory drives. At the heart of the system is a "bracketless" design (Patent Pending), where the accessories bolt directly to the water pump for a clean, integrated form. The design offers superb engine visibility to show off your horsepower, not your accessories. Among the many swap friendly features are bottom heater outlets for clearance in tight applications. The Holley designed alternator is just as innovative. This premium alternator utilizes 6-phase technology as found on the C7 Corvette. The water pump also shares its design efficiencies with that of the C7 Corvette. The compact and reliable SD7 A/C compressor and Type II P/S pump with baffled reservoir are also integrated. The Mid-Mount drive completes Holley's trilogy of accessory solutions giving a third option compared to the High and Low-Mount previously released. All three accessory solutions are for LS engines. When we say "complete", we mean complete. The Mid-Mount system comes with everything you need. All accessories are included; the water pump, A/C compressor, Alternator, P/S pump with reservoir, and an SFI certified damper w/hard anodized billet crank pulley. All pulleys and the belt are supplied. Even heater hose adapters, power steering to -6 AN hardline, and the alternator plug/harness are included. Easy assembly was a priority during the entire development of this accessory solution. Color graphical instructions walk you through every step of the ultra-easy installation. The Premium Mid-Mount system comes with dress up pulley covers and an SFI certified damper. Partnered with this damper is a billet 6061-T6 aluminum hard anodized crank pulley. This system is ready for the racetrack if you want to play or just be ready for anything on the street.

Features:

  • Bracketless accessory mounting with ultra-easy assembly
  • Bottom outlet heater hose options for swap application clearance
  • LT1 style premium 150 amp alternator
  • LT1 style water pump cartridge design
  • Compact SD7 A/C compressor
  • Type II power steering pump with baffled reservoir
  • P/S adapter hardline to AN -6 adapter included
  • Steam tube input port
  • Shortened top outlet nipple for more radiator hose turns and routing room
  • OE pulley ratios for optimal accessory performance
  • No adapters/spacers required!
  • Billet tensioner cover
  • Billet alternator, and compressor pulley covers
  • SFI certified damper w/hard anodized billet crank pulley
  • Works with all common aftermarket and factory Throttle bodies and intakes.
  • Works with VVT applications
  • Works with Hooker turbo manifolds.
  • Fits ALL LS engines except with dry sump and/or supercharger.

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

A/C Compressor Included Yes
A/C Compressor Type SD7
Accessory Drive Style Mid Mount
Alternator Amperage 150
Alternator Included Yes
Application GM LS
Belt Included Yes
Brand Holley
Choose Your Part Accessory Drive Kits
Damper Included Yes
Damper Style SFI Certified
Emission Code 5
Engine GM LS
Finish Cast
Inlet Size 35.4mm/1.4"
Material Cast Aluminum
Output 150 Amps
Power Steering Hardline Included Yes
Power Steering Pulley Included Yes
Power Steering Pump Included Yes
Power Steering Reservoir Included Yes
Product Type Accessory Drive Kits
Pulley Style Serpentine
Tensioner Included Yes
Thermostat Included Yes
Warranty Limited 90 Day
Water Neck Included Yes
Water Pump Included Yes
Water Pump Pulley Included Yes
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 337377375

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VZ
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★★★★★ 3
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The sweater is nice looking, but whoever designed the hoodie didn’t think straight. It’s sewn so that when the hood is pulled over the head, it forms a triangular shape. It is a hoodie suited perfectly for the characters in the movie The Coneheads.
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Reviewed in the United States on March 6, 2024
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Skippy
Carnegie, US
★★★★★ 5
Very nice & heavy sweater.
Size: X-Large, Color: Grey
Very nice and heavy sweater. Im 220lbs and ordered an X-tra large, which is very snug/tight as this is form fitting. Depending on your build, if youre around 220LB with a little bit of stomach maybe order up to get a better fit.
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Reviewed in the United States on October 14, 2025
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Vicki L. Reynolds
Omaha, US
★★★★★ 5
Superb hoodie for mechanics
Size: Large, Color: Dark Green
The #1 favorite hoodie of mechanics. Nice and thick which makes it very warm and durable, and a great fit. My mechanic son gets one of these every year for his birthday, and never wants any other brand.
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Reviewed in the United States on January 20, 2026
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Misty H.
Charlottesville, US
★★★★★ 5
You don’t find high quality sweatshirts like these anymore
Size: Small, Color: Dark Green
Worth every penny! Super warm, comfortable, and excellent quality. Fit is spot on. I love the colors!
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Reviewed in the United States on May 12, 2026
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Benjamin B.
San Leandro, US
★★★★★ 5
Love them!
Size: Large, Color: Dark Green
Love these heavy weight hoodies! I work as a mechanic and put these through a lot. They run true to size in my opinion. Very warm and durable as well! They do shrink after several wash and dry cycles so I would advise either hang drying and not drying with a machine or maybe consider one size larger if you are on the fence.
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Reviewed in the United States on September 8, 2025

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